A mattress spring core comprising at least one corner spring pocket for increasing mattress shape stability

Abstract

A mattress spring core including a plurality of spring pockets arranged in longitudinal columns and transverse rows, wherein at least one corner spring pocket projects longitudinally from an adjacent column end spring pocket.

1 . A mattress spring core comprising a plurality of spring pockets arranged in longitudinal columns and transverse rows, wherein at least one corner spring pocket projects longitudinally from an adjacent column end spring pocket. 
     
     
         2 . The mattress spring core according to  claim 1 , wherein the spring pockets are arranged in a plurality of parallel central spring strings forming a rectangular central part, and in at least two outermost spring strings arranged on opposite sides of the central spring strings, wherein at least one of the outermost spring strings is longitudinally displaced relative the central spring strings. 
     
     
         3 . The mattress spring core according to  claim 2 , wherein a width (W SP ) of the spring pockets of the outermost spring string is smaller or greater than the width (W SP ) of the spring pockets in a central spring string. 
     
     
         4 . The mattress spring core according to  claim 2 , wherein the spring strings are attached to each other side by side by means of an adhesive, preferably a hot melt adhesive, or by ultra-sonic welding. 
     
     
         5 . The mattress spring core according to  claim 2 , wherein the spring pockets of each central spring strings are aligned centre-to-centre with the spring pockets of each adjacent central spring string. 
     
     
         6 . The mattress spring core according to  claim 2 , wherein the central spring strings comprises fewer spring pockets than the outermost spring strings, preferably each of said central spring strings comprises one spring pocket less than each of the outermost spring strings. 
     
     
         7 . The mattress spring core according to  claim 2 , wherein the spring pockets of each outermost spring string are aligned off centre with the spring pockets of each adjacent central spring string. 
     
     
         8 . The mattress spring core according to  claim 1 , wherein the corner spring pockets project longitudinally by at least one third of a spring pocket width (W SP ). 
     
     
         9 . The mattress spring core according to  claim 1 , wherein the plurality of spring pockets have the same width (W SP ). 
     
     
         10 . The mattress spring core according to  claim 1 , comprising four corner spring pockets, each projecting longitudinally from an adjacent column end spring pocket. 
     
     
         11 . The mattress spring core according to  claim 1 , comprising eight corner spring pockets arranged in pairs, each pair of corner spring pockets projecting longitudinally from an adjacent column end spring pocket. 
     
     
         12 . The mattress spring core according to  claim 1 , comprising one or more layers of spring pockets. 
     
     
         13 . The mattress spring core according to  claim 1 , wherein a fabric material of the spring pocket is a nonwoven fabric material comprising thermoplastic material. 
     
     
         14 . The mattress spring core according to  claim 1 , wherein a spring constant of the spring of the corner spring pocket is higher than a spring constant of the spring of the adjacent column end spring pocket. 
     
     
         15 . A mattress comprising the mattress spring core according to  claim 1 , and a mattress cover enclosing said mattress spring core. 
     
     
         16 . A method for manufacturing a mattress spring core comprising steps of:
 providing a plurality of spring pockets arranged in longitudinal columns and transverse rows, and   arranging at least one corner spring pocket such that it projects longitudinally from an adjacent column end spring pocket.   
     
     
         17 . The mattress spring core according to  claim 8 , wherein the corner spring pockets project longitudinally by half of the spring pocket width (W SP ). 
     
     
         18 . The mattress spring core according to  claim 12 , comprising two layers of the spring pockets.